CKX300 POWER PROCESSING AMPLIFIER - Crest Audio

CKX300 POWER
PROCESSING AMPLIFIER
Preliminary Product Description
The Crest Audio CKX300 Power Processing amplifier is designed
specifically for the unique requirements of high quality, transformer-isolated
100V, 70.7V, or 50V operation (factory configured) distributed
sound systems in commercial, industrial and institutional installations.
Design goals met by the CKX300 include exceptional sonic accuracy,
high efficiency, minimum power consumption, comprehensive loudspeaker
protection, and the ability to handle extended duty cycles.
In addition, the CKX300 incorporates Crest Audio’s proprietary modular
approach to input/output and external control configuration. We call
CKX300 Features
• Transformer-isolated outputs.
100V, 70.7V, or 50V operation (factory configured)
• Sequential Turn-On/Off (STO). Standard system uses any +8 to
+18VDC source and contact closure.
• PowerSave. Reduces power consumption at idle by turning off the
bias circuit (and fan if heat sink temperature is below allowed threshold)
when no signal present at input.
• 3 Module Bays. Unique chassis construction provides three separate
bays into which a diverse range of space-saving and cost effective
Input Processing, Network and Power/Output modules can be fitted.
By combining multiple processing and control functions in the amplifier,
CKX Series Power Processing amplifiers significantly save on
installation costs versus conventional outboard processing.
• Cool Operation. High thermal mass heat sinks, with high-efficiency
variable speed fan. Front panel mounted filter for easy maintenance.
• “Overbuilt” Power Supply. In the Crest tradition, the power supply
is “over-engineered” for ample current reserves to meet demanding
load conditions.
• More Transistors. More output devices than comparably-powered
competitive models to provide wider safe operating area and lower
heat generation.
this concept Power Processing. Through the provision of three plug-in
module bays, these amplifiers offer exceptional flexibility with integral
signal processing, load monitoring, and either local or system-wide computer
control via Crest Audio’s NexSys ® network.
The CKX300 amplifier is manufactured exclusively in Crest Audio’s
own USA plant, using only the highest quality components. Key subassemblies
are individually pre-tested, and all units are rigorously
“burned-in” before final checkout on precision test equipment.
• TourClass ® Protection Circuits:
ACL (Active Clip Limiting) prevents speaker damage with gentle
gain reduction at clip threshold.
IGM (Instantaneous Gain Modulation) monitors connected loads to
detect conditions that may overstress output devices, allowing safe
operation into difficult loads.
AutoRamp gradually increases gain to attenuator setting level when
amplifier is turned on.
TourClass also includes comprehensive thermal management, and
short circuit, DC voltage, turn-on/off transient, current inrush and
sub/ultrasonic input protection.
• Selectable input sensitivity/voltage gain (internal jumpers)
• Front panel status indication
• Rear panel attenuators with removable knobs
• Barrier strip input and output connectors
• Optional input isolation transformers
• Front panel label area
Power Specification 100 volt (50 or 70.7 volt option)
40Hz–20kHz, 0.1% THD+N 150W
Figures are watts per channel, both channels driven. NexSys is a registered trademark of Crest Audio Inc.

CKX300 POWER PROCESSING AMPLIFIER
PRELIMINARY SPECIFICATIONS Architect’s & Engineer’s Specifications
The power amplifier shall consist of 2 channels and deliver a
minimum of 150 watts per channel into a 100 volt (50 or 70.7
Output Power, 100 volt (50 or 70.7 volt option)
Max RMS Output Voltage (each channel)
volt option) “constant voltage” line without the need for
external step-up transformers, both channels driven,
40Hz–16kHz, 0.1% THD+N.
Peak Output Voltage (each channel)
A variable speed fan, with the ability to completely turn off
Frequency Response (1W/100V)
Power Bandwidth (rated power, 1% THD+N)
TourClass
under appropriate ambient temperature conditions, shall provide
air flow through the chassis from front to both sides.
The amplifier shall have circuitry to protect itself and the
speaker load from output short circuits, DC voltage on outputs,
and thermal overload. The amplifier shall include circuitry
to gradually increase gain to attenuator setting levels
when amplifier is turned on, and circuitry for impedance
sensing and active clip limiting.
The amplifier shall include an energy saving feature which
shall automatically remove the output stage bias current when
the amplifier is in an idle condition.
The amplifier shall have a voltage gain of X40, or a voltage
gain of X20, or an input sensitivity of 0.775V, for rated
power, internally jumper-selectable. The hum and noise level
shall be greater than 105dB below rated output, A-weighted.
The amplifier shall have a class AB output stage (with a modulated
power supply). The frequency response shall be
greater than 40Hz–16kHz, (-1dB) at rated power. The amplifier
shall operate at either 100, 120, 220, 230, or 240 volts,
50–60Hz AC (configured at factory). Maximum current draw
at 240V shall be no greater than 3.2A, both channels driven
continuously into a 100V line.
Front panel LED indicators shall include Active, Protect,
Signal Present, and ACL (Clip Limiting) LEDs for each channel.
The power switch shall have three positions; one to permit
power up from a remote location, one to permit local
power up, and an “off” position. The fan filter shall be front
panel mounted, with no tools required for removal.
The rear panel shall be configured with three openings or
bays which will accept plug-in modules used to accomplish
input signal processing, network control, remote sequential
turn-on/off and other related functions. The output module
shall be fitted with the following connectors: 5mm, 4-pin
Phoenix for sequential turn-on/off wiring, and a touch-proof
output barrier strip with 0.438" (11mm) screw spacing, and
0.320" (8mm) lug space. The input module shall be fitted with
an input barrier strip connector with 0.320" (8mm) screw
spacing, and 0.270" (7mm) lug space, and two individual
channel attenuators with removable knobs.
A user re-settable AC mains circuit breaker and an IEC AC
mains socket shall be provided on the rear panel. A single AC
mains cord having an appropriate AC plug for the intended
operating voltage shall be provided.
The packaging of the amplifier shall allow for standard rack
mounting without requiring space between similar units.
Dimensions shall be 19" (435mm) wide, 5.25" (133mm) high
and 17.13" (435mm) deep. It shall weigh 35lbs. (15.91kg) net.
Rear View
The amplifier shall be designated the Crest Audio model
CKX300 .
® 40Hz–20kHz, 0.1% THD+N
150 Watts
105V
150V
Protection
38Hz–38kHz, +0/-3dB
40Hz–16kHz, +0/-1dB
ACL, IGM, AutoRamp, short circuit, DC voltage, turnon/off
transient, current inrush, sub/ultrasonic input.
THD+N (rated power, 1kHz)
SMPTE IMD (rated power, 60Hz & 7kHz)
20kΩ, >10kΩ
Hum and Noise (below rated power)
Crosstalk (below rated power)
105dB, A-weighted
>60dB @ 1kHz
Class AB
Input Connectors (per channel) Rear-panel barrier strip input, 4-pin Phoenix sequential
turn-on/off connector on standard CC-STL module
Output Connectors (per channel) Touch-proof rear-panel barrier strip output
Filter Storage
Power Supply (factory configured)
Idle Current Draw (240V)
36,000µF
100–240V, 50–60Hz
0.25A (PowerSave active)
1/8 Power Current Draw (typical music, 240V)
1/3 Power Current Draw (cont. music, 240V)
Max Current Draw (breaker rating, 240V)
1.6A
2.1A
3.2A
Thermal Emissions (1/8 Power, 240V) 555BTU/hr
Thermal Emissions (1/3 Power, 240V) 683BTU/hr
Cooling Variable speed, front panel mounted fan,
front-to-side airflow
Controls 3-position front panel On/Remote/Off switch, two rearpanel
channel attenuators, AC mains circuit breaker
LED Indicators (per channel) Active, Protect, Channel Signal, Channel ACL
Construction Steel chassis, 16 gauge.
Double thickness in rack ear areas.
Dimensions (Height x Width x Depth) 5.25" x 19" x 17.13" / 133 x 483 x 435mm
Gross Weight, Net Weight 40lbs. (18.18kg), 35lbs. (15.91kg)
Power figures are watts per channel,
both channels driven.
Crest Audio reserves the right to
make improvements in manufacturing
or design which may affect
specification.
Crest Audio specification literature
is available in electronic form to
qualified users. Contact Crest
Audio Inc. for more information.
©1997 Crest Audio Inc.
v. 1.1 10/3/97 A3300035
In
Out
Com
Sequential
Turn-On
+8 to 18VDC
20 mA
NEC
CLASS 2 ONLY
Model
CC-STL
CLASS 2
WIRING MAY
BE USED
Output
–
A
+
+
B
– Signal
Ground
Lift
Jumper
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
*A3300035*
Output Power
@70.7V/Ch.
50W
100W
200W
400W
800W
1200W
Model
Name
CKX 150
CKX 300
CKX 500
CKX 800
Output
Power
@100V/Ch.
75W
150W
250W
400W
Model
Name
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Designed & manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Output Power
@8Ω/Ch.
50W
100W
200W
400W
400W
600W
800W
Model
CC-BLK
Input A
Input B
+ – + –
Level 4 5
6
A 3 7
2
8
1
9
0 10
Level 4 5
6
B 3 7
2
8
1
9
0 10
Model
CC-IPB
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: 201.909.8700 FAX: 201.909.8744
http://www.crestaudio.com
Printed in USA